Curved-vibrator linear piezoelectric motor and driving method thereof

Abstract

The invention discloses a curved-vibrator linear piezoelectric motor. The stator includes a metal elastomer and a plurality of sets of piezoelectric stacks at two sides. The plurality of sets of piezoelectric stacks are installed at the two ends of the metal elastomer and are symmetric relative to the central axis of a piezoelectric vibrator in a 180-degree horizontally mirror manner. A driving pin is arranged at the middle convex portion of a semi-elliptical structure included by the metal elastomer. During the driving process, the driving pin pushes a mover to make linear or rotation motionon a motor fixation plate. According to the invention, because of polarized deformation of a piezoelectric ceramic sheet along an axial direction, the amplitude of the driving pin is enhanced, so thatthe motor energy conversion rate and the output are improved; and on the basis of the structural characteristics of the motor, voltage excitation modes like alternating-current macro driving, direct-current single-phase driving, and direct-current micro driving are realized. The curved-vibrator linear piezoelectric motor having a simple structure is convenient to assemble and repair; the controlperformance is good; and the driving control is diversified. The curved-vibrator linear piezoelectric motor can be applied to the precise positioning on a macro-micro drive control platform and has the broad industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of linear piezoelectric motors, and in particular relates to a piezoelectric stack-based arc-shaped oscillator linear piezoelectric motor and a driving method thereof. Background technique [0002] Piezoelectric motor is a new type of micro motor that was developed and applied rapidly in the 1980s. Different from the working principle of the traditional electromagnetic motor, it is a high-tech product based on piezoelectric effect and ultrasonic vibration. Its research and ultra-high-precision machining involve many disciplines such as mechanical vibration, mechanical design, power electronics, and automatic control principles, as well as their intercrossing and mutual integration. Piezoelectric motors have the advantages of compact structure, low speed and high torque, fast response, electromagnetic compatibility and good control performance, and have been widely concerned and applied in the fields of robo...

AI Technical Summary

Problems solved by technology

The vibrator mostly uses a rectangular sheet-shaped ordinary piezoelectric stack. In order to make the surface particles of the driving foot produce an elliptical motion trajectory and better output performance, the longitudinal bending and bending vibration frequencies of the vibrator need to be consistent. However, due to the flexible hinge near the driving foot The enlarged micro-displacement is limited, and its volume is large, so it is difficult to realize high-precision micro-drive. The structure of the existing macro-micro-drive is complex, and the system is difficult to integrate

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